Initial reports referenced the player being involved in a first-half "collision", but subsequent enquiries suggest the incident was no worse than a regulation tackle, and he displayed no obvious concussions through most of the game or half-time break.
As soon as his deteriorating condition was brought to the referee's attention, about five minutes before full-time, the player was sent from the field and he collapsed on the sideline soon after.
With concussion and "brain injury" being such a contentious issue in contact sports, all club coaches are required to undergo safety training under the ACC-sponsored RugbySmart programme.
Referees must adhere to the "Blue Card" concussion initiative, trailed in Northland during the 2014 season.
"If the referee believes a player has been concussed or suspects a player has been concussed, the referee must show a Blue Card to that player and that player will be required to leave the playing area," says the protocols. "This player cannot return and play in that match."
But the "Blue Card" initiative also states that the referee cannot be held solely responsible or liable if a player is found to be concussed under their watch, and that player safety is "the joint responsibility of many".